D2.2 - Investigation and assessment of the potential technologies for the flexi-grid optical path-packet Infrastructure for Ethernet Transport

Executive Summary:

This deliverable presents the work performed by STRAUSS project during its second year (Y2) in
terms of investigation and assessment of the potential technologies for the flexi-grid optical pathpacket
infrastructure for Ethernet transport. Based on the previous requirement analysis in D2.1, the
key technologies, including software-defined sliceable transceiver, flexible/adaptable optical nodes,
variable capacity OPS and the integrated OPS/OCS interface, are investigated and assessed by
simulation and experimental verification. The most potential solution or technologies are selected to
enable the flexi-grid optical path-packet infrastructure. This document provides a description of the
potential technologies and the related test results.

In OPS domain, L-VC OPS network based on the OFDM technologies have been investigated and
some practical adaptive-modulation technique, such as for designing the cross-talk tolerant packets,
have been proposed. Furthermore, application throughput and latency of the distance-adaptive
DMT-based OPS network have been analyzed.

In regard to the Software-defined sliceable transceiver, OFDM technologies have been investigated
to enable 400Gb/s optical Ethernet scenario. A 400Gb/s DMT transponder prototype have been
implemented and demonstrated successfully. For the implementation of the sliceable OFDM
transceiver, an OFDM-based BVT, able to generate a single multi-format rate/distance adaptive
flow, has been studied and optimized. It can be used as S-BVT building block for cost-sensitive
applications, targeting the metro/regional network segment and inter-DC communication.
Rate/margin adaptive algorithms have been developed and integrated within the DSP modules of the
BVT to enable bit and power loading of the individual subcarriers for rate/distance adaptive
transmission according to the capacity request and channel estimation. The real-time implementation
of the OFDM-based transmitter have been developed and tested. Detailed research have been carried
on to investigate the system performance by means of numerical simulation and experimental
demonstration. In addition, a 40Gbaud QPSK/16QAM multi-format transmitter is developed to
enable spectral-efficient transmission in OCS-based Core optical networks.

With regards to optical node design, flexible/adaptable optical nodes is developed based on AoD
concept for flexi-grid DWDM networks. The node composing algorithms are used to synthesis and
reconfigure the optical nodes, while the optical monitoring modules monitor the synthesized optical
node and guarantee it work correctly. The proposed AoD-based optical nodes deploy network
functions according to the traffic requests, which will improve hardware utilization efficiency. For
the prototype implementation, we have achieve several optical node functions, such as architecture
programmable ROADM, software-defined programmable transmitter. The software-defined
programmable transmitters provide interfacing between OPS and flexi-grid OCS domain for
extremely large optical capacity.

The integrated OPS/OCS interface, which is developed with FPGA develop board (HTG-V6HXTX16PCIE
board), provides two hybrid ports (OCS/OPS traffic) and two OCS-only ports. The hybrid
ports are used to connect to the OPS domain, while the OCS-only ports are to the OCS domain. The
OPS-OCS integrated interface convert OPS traffic to OCS domain and forward traffic to high baud
rate transmitters in OCS domain for spectral efficiency transmission.

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